[PATCH -next] acpi: fix acpi_bus.h warnings when ACPI is not enabled

[Randy Dunlap]

From: Randy Dunlap <rdunlap@xxxxxxxxxxxx>

Fix header file warnings when CONFIG_ACPI is not enabled:

include/acpi/acpi_bus.h:443:42: warning: 'struct acpi_bus_type' declared inside parameter list
include/acpi/acpi_bus.h:443:42: warning: its scope is only this definition or declaration, which is probably not what you want
include/acpi/acpi_bus.h:444:44: warning: 'struct acpi_bus_type' declared inside parameter list

Signed-off-by: Randy Dunlap <rdunlap@xxxxxxxxxxxx>
---
 include/acpi/acpi_bus.h |    2 ++
 1 file changed, 2 insertions(+)

--- linux-next-20120523.orig/include/acpi/acpi_bus.h
+++ linux-next-20120523/include/acpi/acpi_bus.h
@@ -440,6 +440,8 @@ static inline int acpi_pm_device_sleep_w
 
 #else	/* CONFIG_ACPI */
 
+struct acpi_bus_type;
+
 static int register_acpi_bus_type(struct acpi_bus_type *bus) { return 0; }
 static int unregister_acpi_bus_type(struct acpi_bus_type *bus) { return 0; }
 
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